[GaryL]

My dad's 05 AWD Denali Yukon XL Denali makes the same noise. We haven't put it in the shop to check it out yet but are planning on it real soon. If I find something out, I will post it here.

 

[GaryL]

Put my dad's Denali in the shop yesterday. They said the noise we were hearing is bad bearings in the front diff. They are rebuilding it under warranty.

 

[GaryL]

Got the truck back today. They replaced all of the bearings except the pinion bearing because that one was still fine. It drives nice and quiet now.

 

[GaryL]

I don't know if there was a bulletin or not, they didn't tell us. Good luck.

 

[GaryL]

Glad you got it fixed properly. Now just enjoy it.